Valve for grease guns



Jan. 17, 1928. 1,656,763 W. B. SIBLEY VALVE FOR GREASE GUNS fix v 1INVENTOR.

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. lo I I vide a ball check valvepreventing discharge.

Patented Jan. ,17, 1928 UNITED STATES 1,656,763 PATENT OFFICE.

WESLEY B. SIBLEY, OF DETROIT, MICHIGAN, ASSIGNOR TO ACME DEVICESCORPORA- TION, or DETROIT, MICHIGAN,

A CORPORATION OF MICHIGAN.

VALVE FOR GREASE GUNS.

Application filed October 20, 1926. Serial No. 142,881.

This invention relates to valves for grease I guns and'the object of theinvention is to provide a valve for a grease gun which will preventdischarge of lubricant except under pressure. 7

Another object of the invention is to provide a means for packing thevalve so that I no discharge of grease can occur between the I assembledparts which contain the valve.

'A further object of the invention is to proofgrease from the gun exceptwhen under pressure the ball being provided with a cup shaped leathercover to properly seat and close the discharge opening. V a

7, These objects and the several novel features of the invention arehereinafter more .fully' described and claimed and the preferred form ofconstruction by which these 2o objectsare attained is shown in theaccom-f panying drawings in which Fig. l is an elevation of a grease gunem bodying my invention. c Fig. 2 is a longitudinal sectiontherethrough.

Fig. 3 is a section taken on line 3 3 of Fig. 2. n Fig. 4 is a sectionshowing an alternative type of valve. 7 p 80 Fig. 5 is an end view ofthe discharge end of the gun. v

Fig. 6 is a perspective view of the fitting .7 with which the gun isused.

- "As shown in Figs. 1 and 2 a cylindrical barrel 1 is provided for thegun and a cap 2 is threaded onto one end thereof. A stem 3extendslongitudinally through the cap and barrel and is provided withlugs 4 preventing the stem from being drawn out of the cap. A plunger isprovided consisting of a cup shaped leather washer 5 which is se-' curedbetween two metal plates 6 and 7. The plate 7 is extruded at the centerproviding a flange 8 which bindingly secures the 46 parts of the plungertogether and forms a 1 guide for the plunger on the stem 3. The 2 cupshaped washer 5 fits the interior of the cylindrical barrel 1 and theplate 7 is pro v vided with a downwardly struck lug 9 which provides ameans for securing the washer 10 tothe plate 7 the washer 10 forming anadditional guide for the plunger on the stem. At the lower end the stemis provided with a pair of lugs 11 which prevent the plunger 56 fromcoming oil from the stem when the gun v posite end into the chamber 14.A discharge aperture 16 is provided leading from the bottom of thechamber 16 which is normall closed by the cup shaped leather washer 1within which the ball 18 is positioned. The ball 18 is yieldably held inposition by the spring 19 which seats in a member 20. This member 20 isprovided with a conical outer faoe'21 which fits a similar face providedin the discharge end 13. The member 20 is preferably made of fiber andtightly fits the conical face in the end of the member 13 so that noleakage of grease can occur between these two parts. he fiber member 20is held in place by a member 22 threaded onto the portion 13. A member23 is threaded onto the member 22 as shown in Fig. 2 and is providedwith an opening 24 in the center into which a pair of notches 25 open.This end is adapted for connection with a fitting 26 shown in Fig. 6which is provided with a pair of lugs 27 adapted to be inserted throughthe notches 25 in the member 23. The fitting 26 is provided with anopening in the end which is normally closed by a spring pressed ball 28shown in Fig. 6 and the lower .end of this fitting is threaded as gun ispositioned over the fitting 26 as shown in Fig. 2 and is given a partialturn so that the lugs'27 are engaged between the members 23 and 22. Thedistance between the top of the lugs 27 and the top of the member 26 isabout one sixty-fourth of an inch greater than the distance between thebottom of the fiber member 20 and the bottom of the member 22 so thatthe end of the fitting 26 is held tightly against the member 20 toprevent leakage of grease. The central aperture 29 in the member 20registers with the central aperture in the fitting 26 so that the greaseunder pressure forces 1 the ball 28 downwardly a-nd allows grease topass through the fitting 26.

In operation the barrel 1 is filled with grease and this grease may passthrough the has time upon downward movement of the stem grease isdischarged from the chamber 14:

past the ball 18 and out through the disr The use of the "gun isparticularly efiicacioiisflll ithout' the charge nozzle. Thestein isthendrawn up;

' wardly thus drawing vacuum into the chamber l lflivhich is suddenlyrelieved as the end of the stem 3 moves past the end of the notches 15and the vacuum draws additional grease through -the- -notches"15 to fillthe As the grease is discharged grease is practically all used up. r Ileather covered ball in this use of this leather cov'er'the ball willnot seat properlywhen any lintor foreign inatter is present in thegrease. When'the-ball does not seat properly the withdrawal of the,stemfrom the chamber- 14 draws airpast the ball to relieve thevacuuin'thuspre- "chamber andpreve'nting proper opera tion ofthe greasegun. "By use ofthe leather 7 cover'f for the ball the discharge. opening'16 is sealedand the drawing of the-vac- V uuin in the chamberla tend-to seal the chamber more tightly at the 'discharge end f and-as theleather is soft and-flexible for: feign matter or lint doesnot-"'preven'tthe proper sea-ting'offthe valve.

An" alternative form" of" construction is showninfFig. 4 in which thechamberz27 for the ball is'flared out at'the bottom and'afcupq *shaped'leatherwasher 28 is provided havingtaperedupperedge 29am} a centralaper-' ture 30-through which the grease may pass. 0

This washer s'ea'ls't-he jointbetween the lower end of the part'13 andthe nut 81"Which, is

threadedbnto the end-13'. ln 'thiswforin the grease "under" pressureholds the leather 1 washer 28 inengagement with the Walls of the chamber27' and prevents leakage about the washer and the ball is provided'witha -cup shaped'leather cover-3'2 which tends to seal the "dischargeopening 16from the cham ber 14 inthesame 'manner'as the ball'and"leather cover shown inFigpQ. I

From-the foregoing description it becomes evident that the device is I Iverysimple {and eflicient in" operation will not easily-get" outof'order, is composed of few'parts and is offconsequent lowmanufacturing cost and provides a device which accomplishes" theobj'ects described.-

Havi'ng thus fully described my invention,

its utility and mode of operation, what I "claim and desire to secure byLetters Pat- -cnt ofthe'United States is" I, 1

1; Thecombinati'onl with grease gun having a discharge chamber and -avalve) chamber provided with a; conical inner Wall of-a packing memberhaving a dis-- charge aperture therethrough and ha-ving' a valveseat apacking member at'the-outlet conical outerjwall fitting andi packing thconicalv inner wall f t Valve er V means for maintaining the conicalwall of l The con ibination t'i ith grease gun 5 having dischargechamber and waiv 1' chamberhaving'a conical, inner wall, (ifa packingmember having a discharge aperture therethrough, and having 'a-'con1calouter Wall 7 fitting and packing the conical i1 inner wall ofth'eValv'echamben'ineans for, maintaining the conical-wall 'of'the packingi memberin, seated relationiwith the comple mental wall of the valve chamber, acoiled" spring seating in the packing member, and 1 a 'ball'yieldably'supported en the 'spi'i'ngg' venting the grease i'rom*flowing into the]and normally closing the'discharge enact the discharge chamber;

3. In a grease gun to be discharged; the said chambered portionterniin'atingin an externally'threaded, inter- I nally conede'ndyanapertured packing memher having i an externally "coned "surface fit- J iting in the coned surfaceloftheasaid end a I;

: third aperturedmember in mniy thread-- 1 ed for threaded engagementwith the said end and having-a" shoulder providing] for the said packingmember where 3; S k i Y in (a h "PHC klng member is =iorced to'isealinggien-b gagement with said conical end,: emit-in" vi the said end;and a spring between? the ball and the packing memberiiorniallyf'iorcing 1 *the sa'in'e to close'the's'aid' chamber;

,4. In a grease gun having dischargechambenla valve chamber. attheendlth'ereof; J

a ball in the chamber, a cup, shaped member i i V of leather looselyfitting fever the ball a I cylindrical coiled spring extending into thpph r and'engaging the'ball' 'pre-.. 7 7 venting displacementof'the'le'atliericup-and j tending to inaintainthe ball with tlie'-- cupped i leather in'sealing'engagement 'withthe dis-g -1 charge end of thedischargechamberi l 1 is greaseguns,"wherein niaterial is'dis 1 chargedunder pressure, a n'oz zle forniationl5 including a; chamber throughfnfhl'c'l'i the masterial is dischiarge'd a 'packing'inember at theoutlet" of said ch'a1nber,;tl1e said -'ch m V her and packing memberhaving com-plan ng tal faces co-operating in tlie=assembly to:

'provicle 'a conical'seating; relation therebe tween,":and a removable Ing the pack ng member to'it's'seatiy" 1 member f0rfseci1r- 6: grease'gunsywhere' 'ma terialiis discharged under'-- pressure, a nozzle jorrntion including al'chamber through which the material "isdiscl-iarged5said chamberhaving L30.

of said chamber, the said chamber and packing member havingcomplement-a1 faces cooperating in the assembly to provide a conicalseating relation therebetween, a removable member for securing thepacking memher to its seat, said packing member having a depressed seat,and a spring-held closure for the chamber valve seat, the spring of theclosure extending into contact with such depressed seat.

7. In grease guns, wherein material is discharged under pressure, anozzle formation including a chamber through which the material isdischarged, a packing member at the outlet of said chamber, the saidchamber and packing member having complemental faces co-operating in theassembly to provide a conical seating relation therebetween, and aremovable member for securing the packing member to its seat, saidremovable member having an open end for the recep tion of a connectingfitting, said packing member being exposed within such open end, wherebysaid fitting will provide an additional means for maintaining the seatedrelation of the packing member.

In testimony whereof I sign this specification.

WESLEY B. SIBLEY.

